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Brazil
Tucumã (Boa Esperanca) Project

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 Location:
308 km SW from Marabá, Brazil

  Project Contacts:
Fazenda Caraíba, S/N
Jaguarari
Brazil
48967-000
Phone  ...  Subscription required
Fax55-74-3532-8310
WebsiteWeb
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  • Overview
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  • Fleet
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  • Filings & News

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Overview

StageConstruction
Mine TypeOpen Pit
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life12 years (as of Jan 1, 2021)
Low capital-intensity open pit copper project. 20% physical completion as of 2022 year-end.
Latest NewsEro Copper Reports Second Quarter 2023 Operating and Financial Results     August 3, 2023


Owners

Source: p. 11
CompanyInterestOwnership
Ero Copper Corp. 99.6 % Indirect
Mineração Boa Esperança S/A (operator) 100 % Direct
Ero Copper Corp directly holds approximately 99.6% of the voting shares of Mineração Caraíba S.A. (“MCSA” or “Mineração Caraíba”). MCSA holds a 100% interest in the Tucumã Project.

Contractors

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Deposit Type

  • IOCG
  • Breccia pipe / Stockwork


Summary:

The Boa Esperança deposit crops out as an isolated hill, which is a north–northeast elongated. The topographic high is formed by quartz and magnetite breccias, which cut the Neoarchean biotite granite, the host of the copper mineralization. (2.85 Ga). The Boa Esperança deposit extends for approximately 850 meters in a WSW-ENE direction, for 640 meters in NNW-SSE direction, and is currently known to a depth of 780 meters below surface through drilling. It has a steep SE plunge and remains open in this direction. The deposit is hosted in a series of breccias cross-cutting a granite intrusion. Mineralization consists of a series of brecciated zones, which are aligned N60°–70°E and dips to the southeast at 60°–70. An alignment of approximately N40°E can be observed in the field and coincides with the strike direction of the Boa Esperança hill. The breccias are concentrated around the top of the hill, occupying an area of approximately 450 x 350 m. The copper mineralization, based on drilling to date, has a geometric shape similar to an inverted cone. Currently known mineralization lies between elevations of 350 m to -200 masl. The breccias are distributed throughout the barren pink granite lenses. The Boa Esperança deposit displays primary and secondary zoning. The primary zoning corresponds to a distal zone, where pyrite (py) dominates, grading towards copper mineralized zones of pyrite–chalcopyrite (py–cpy), chalcopyrite–pyrite (cpy–py) and chalcopyrite (cpy). The secon ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The planned Boa Esperança mine will use conventional open pit mining techniques and diesel mining equipment to mine a total of 203 Mt of material over the LOM. This will consist of 54 Mt of ore and 149 Mt of waste material. Selective mine practices will be applied avoiding dilution. The operation will include normal drilling, blasting loading with 5.2 m3/3.9m3 (waste/ore) backhoe configured excavator and 38 t conventional trucks over an 8 m bench height (double bench of 16 m in fresh rock in interim and final slopes). Mining will be performed on a sub-bench of flitch basis to improve selectivity.

The mine plan was developed by NCL. The plan is focused on a single mine area, mined through consecutive mining phases or pushbacks. The mill throughput is based on an economic throughput assessment study, resulting in an average throughput of 4.0 Mtpa of sulphide ore and a ramp-up period of 12 months that assumes a production rate of 3.2 Mt in the first year of production. Production starts during the second quarter of Year 1 to avoid the rainy season.

The required pre-stripping amounts to 13.2 Mt, and activities have been scheduled over 24 months, starting in Year -2 quarter 2, through Year 1 quarter 1. The mining schedule requires an average mine extraction of 20 Mtpa. The mine movement decreases from Year 10 until the mining operations are completed in Year 12.

The mine is scheduled to work on a seven-days-a-week, three 8-hour shift basis, for 365 ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Payable metal M lbs 62690
Copper Metal in concentrate M lbs 718

Operational Metrics:

Metrics
Daily processing rate  ......  Subscription required
Annual mining capacity  ......  Subscription required
Annual processing rate  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at August 31, 2021:
Open Pit Mineral Resources are stated at a cut-off grade of 0.20% Cu and are fully contained within an optimized pit shell.

Underground Mineral Resources are stated within optimized stopes below the pit shell. A cut-off grade of 0.51% Cu and a marginal cut-off grade of 0.32% Cu were applied in the stope optimization.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (OP) 30,674 kt Copper 0.89 % 273.21 kt
Probable In-Situ (OP) 12,378 kt Copper 0.67 % 83.35 kt
Proven & Probable In-Situ (OP) 43,052 kt Copper 0.83 % 356.56 kt
Measured In-Situ (OP) 32,593 kt Copper 0.94 % 305.65 kt
Indicated In-Situ (OP) 15,095 kt Copper 0.7 % 106.06 kt
Measured & Indicated In-Situ (OP) 47,687 kt Copper 0.86 % 411.71 kt
Inferred In-Situ (OP) 554.82 kt Copper 0.65 % 3.6 kt
Inferred In-Situ (UG) 11,035 kt Copper 0.8 % 88.62 kt
Inferred Total 11,590 kt Copper 0.8 % 92.22 kt

Commodity Production Costs:

CommodityUnitsAverage
C1 cash costs Copper USD  ......  Subscription required
C3 fully allocated costs Copper USD  ......  Subscription required
Assumed price Copper USD  ......  Subscription required
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
OP mining costs ($/t mined) USD 2.13 *  
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 247
Freight costs $M USD 80
Transportation (haulage) costs $M USD 88
G&A costs $M USD 24
Total OpEx $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Water Supply
Source: Subscription required

- subscription is required.


Proposed Heavy Mobile Equipment as of August 31, 2021:
HME TypeModelSizeQuantityLeased or
Contractor
Backhoe ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Corporate Presentation 2023
Annual Information Form 2022
Annual Report 2022
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Annual Information Form 2018
Feasibility Study Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Ero Copper Reports Second Quarter 2023 Operating and Financial Results August 3, 2023

Subscription required - Subscription is required.

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